Add MacOS content_shell download to homebrew formula update app.

Add MacOS content_shell download to homebrew formula update app.

BUG=dartbug.com/21717
R=ricow@google.com

Committed: https://code.google.com/p/dart/source/detail?r=42251

[Bill Hesse, 2014-12-10 10:30:24]

whesse@google.com changed reviewers:
+ nivco@google.com, ricow@google.com

[ricow1, 2014-12-10 10:33:11]

lgtm

[Nicolas Garnier, 2014-12-10 10:41:15]

https://codereview.chromium.org/788043004/diff/1/tools/apps/update_homebrew/b...
File tools/apps/update_homebrew/bin/update_homebrew.dart (right):

https://codereview.chromium.org/788043004/diff/1/tools/apps/update_homebrew/b...
tools/apps/update_homebrew/bin/update_homebrew.dart:122: resource
'content_shell' do
I think this should be put below the "devel" block. For some reasons I get
errors when it's placed above. (Can't explain it though). Here is the error I
get:

Error: Resource "content_shell" is defined more than once

[Bill Hesse, 2014-12-10 14:22:36]

On 2014/12/10 10:41:15, Nicolas Garnier wrote:
>
https://codereview.chromium.org/788043004/diff/1/tools/apps/update_homebrew/b...
> File tools/apps/update_homebrew/bin/update_homebrew.dart (right):
> 
>
https://codereview.chromium.org/788043004/diff/1/tools/apps/update_homebrew/b...
> tools/apps/update_homebrew/bin/update_homebrew.dart:122: resource
> 'content_shell' do
> I think this should be put below the "devel" block. For some reasons I get
> errors when it's placed above. (Can't explain it though). Here is the error I
> get:
> 
> Error: Resource "content_shell" is defined more than once

OK, moved to the place below the "devel" block.

[Bill Hesse, 2014-12-10 17:04:40]

Committed patchset #2 (id:20001) manually as 42251 (presubmit successful).